You'll lose sluggish performance and long render times ;-)
Edit: I'm confused. Are you downgrading to CS4?
By grading from CS5 to CS4, what functions will I lose in CS4?
If you mean by Upgrading from CS4-CS5 what functions of CS4 will be loss?
well.... constant crashing and lag might be lost
Yes...I'm hoping to get rid of crashes and glitches. Actually...what I meant to question was...will I still be able to use my CS4 program if I wanted to or will it lose all functionality? I'm sure 5 will open everything from 4 but I wanted to see if I would have a dormant program or still some functionality.
CS4 and CS5 can both be installed and peacefully coexist. You can choose to run one or the other as you like, even at the same time, although I don't know if that is allowed under the license agreement.
Can someone confirm that dynamic link type operations work in CS4 (without opening CS5 apps) once CS5 is installed?
When installing CS4 over CS3, CS3 operations between programs in the suite do not work: Send to Encore from PR CS3 opens in EN CS4. Edit in photoshop from EN CS3 opens in Photoshop CS4, etc.
I have CS5 installed on a new machine alone, so I can't test this.
> Can someone confirm that dynamic link type operations work in CS4 (without opening CS5 apps) once CS5 is installed?
I just tried. I was able to link from After Effects CS4 to Premiere Pro CS4 on a computer that also has CS5 Master Collection installed.
All of my computers have both CS4 and CS5 installed, and I have yet to notice them interfering with one another---except when I made the foolish mistake of installing a CS4 suite _after_ installing a CS5 suite. That was bad. Don't do that. But installing CS5 after CS4 works fine.
Just to be clear (and I don't think I was originally)...the upgrade is from CS4 to CS5. I see that CS4 is still available and operating. I just wanted to make sure it wouldn't become "dead" after upgrading to CS5.
Thanks for all the information and responses.